Activation key



FIG. 1 is a front view of an activation key showing my new design;

FIG. 2 is a right side view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left view; and

FIG. 5 is a top side view; and,

FIG. 6 is a bottom view. 

The ornamental design for an activation key, as shown and described. 